Search (51 results, page 1 of 3)

  • × theme_ss:"Semantisches Umfeld in Indexierung u. Retrieval"
  • × year_i:[1990 TO 2000}
  1. Walker, S.: Subject access in online catalogues (1991) 0.08
    0.08352602 = product of:
      0.16705205 = sum of:
        0.013732546 = weight(_text_:information in 5690) [ClassicSimilarity], result of:
          0.013732546 = score(doc=5690,freq=2.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.1551638 = fieldWeight in 5690, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0625 = fieldNorm(doc=5690)
        0.1533195 = weight(_text_:standards in 5690) [ClassicSimilarity], result of:
          0.1533195 = score(doc=5690,freq=6.0), product of:
            0.22470023 = queryWeight, product of:
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.050415643 = queryNorm
            0.68232906 = fieldWeight in 5690, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.0625 = fieldNorm(doc=5690)
      0.5 = coord(2/4)
    
    Abstract
    Discusses some of the methods of subject access to on-line catalohues (OPACs) and argues that none are entirley satisfactory. Describes 2 methods for improving subject access: best match searching; and automatic query expansion application and discusses their feasibility. Mentions emerging application standards for information retrieval and concludes that existing standards are incompatible with most methods for improving standards
  2. Efthimiadis, E.N.: End-users' understanding of thesaural knowledge structures in interactive query expansion (1994) 0.03
    0.033688493 = product of:
      0.13475397 = sum of:
        0.13475397 = sum of:
          0.080108985 = weight(_text_:organization in 5693) [ClassicSimilarity], result of:
            0.080108985 = score(doc=5693,freq=4.0), product of:
              0.17974974 = queryWeight, product of:
                3.5653565 = idf(docFreq=3399, maxDocs=44218)
                0.050415643 = queryNorm
              0.44566956 = fieldWeight in 5693, product of:
                2.0 = tf(freq=4.0), with freq of:
                  4.0 = termFreq=4.0
                3.5653565 = idf(docFreq=3399, maxDocs=44218)
                0.0625 = fieldNorm(doc=5693)
          0.054644987 = weight(_text_:22 in 5693) [ClassicSimilarity], result of:
            0.054644987 = score(doc=5693,freq=2.0), product of:
              0.17654699 = queryWeight, product of:
                3.5018296 = idf(docFreq=3622, maxDocs=44218)
                0.050415643 = queryNorm
              0.30952093 = fieldWeight in 5693, product of:
                1.4142135 = tf(freq=2.0), with freq of:
                  2.0 = termFreq=2.0
                3.5018296 = idf(docFreq=3622, maxDocs=44218)
                0.0625 = fieldNorm(doc=5693)
      0.25 = coord(1/4)
    
    Date
    30. 3.2001 13:35:22
    Series
    Advances in knowledge organization; vol.4
    Source
    Knowledge organization and quality management: Proc. of the 3rd International ISKO Conference, 20-24 June 1994, Copenhagen, Denmark. Ed.: H. Albrechtsen et al
  3. Gauch, S.; Chong, M.K.: Automatic word similarity detection for TREC 4 query expansion (1996) 0.03
    0.033194643 = product of:
      0.13277857 = sum of:
        0.13277857 = weight(_text_:standards in 2991) [ClassicSimilarity], result of:
          0.13277857 = score(doc=2991,freq=2.0), product of:
            0.22470023 = queryWeight, product of:
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.050415643 = queryNorm
            0.59091425 = fieldWeight in 2991, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.09375 = fieldNorm(doc=2991)
      0.25 = coord(1/4)
    
    Imprint
    Gaithersburgh, MD : National Institute of Standards and Technology
  4. Gauch, S.; Wang, J.: Corpus analysis for TREC 5 query expansion (1997) 0.03
    0.033194643 = product of:
      0.13277857 = sum of:
        0.13277857 = weight(_text_:standards in 5800) [ClassicSimilarity], result of:
          0.13277857 = score(doc=5800,freq=2.0), product of:
            0.22470023 = queryWeight, product of:
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.050415643 = queryNorm
            0.59091425 = fieldWeight in 5800, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.09375 = fieldNorm(doc=5800)
      0.25 = coord(1/4)
    
    Imprint
    Gaithersburgh, MD : National Institute of Standards and Technology
  5. Smeaton, A.F.; Kelledy, L.; O'Donnell, R.: TREC-4 experiments at Dublin City University : thresholding posting lists, query expansion with WordNet and POS tagging of Spanish (1996) 0.03
    0.0276622 = product of:
      0.1106488 = sum of:
        0.1106488 = weight(_text_:standards in 7000) [ClassicSimilarity], result of:
          0.1106488 = score(doc=7000,freq=2.0), product of:
            0.22470023 = queryWeight, product of:
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.050415643 = queryNorm
            0.49242854 = fieldWeight in 7000, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.4569545 = idf(docFreq=1393, maxDocs=44218)
              0.078125 = fieldNorm(doc=7000)
      0.25 = coord(1/4)
    
    Imprint
    Gaithersburgh, MD : National Institute of Standards and Technology
  6. Chang, C.-H.; Hsu, C.-C.: Integrating query expansion and conceptual relevance feedback for personalized Web information retrieval (1998) 0.02
    0.023969568 = product of:
      0.047939137 = sum of:
        0.024031956 = weight(_text_:information in 1319) [ClassicSimilarity], result of:
          0.024031956 = score(doc=1319,freq=8.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.27153665 = fieldWeight in 1319, product of:
              2.828427 = tf(freq=8.0), with freq of:
                8.0 = termFreq=8.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0546875 = fieldNorm(doc=1319)
        0.023907183 = product of:
          0.047814365 = sum of:
            0.047814365 = weight(_text_:22 in 1319) [ClassicSimilarity], result of:
              0.047814365 = score(doc=1319,freq=2.0), product of:
                0.17654699 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050415643 = queryNorm
                0.2708308 = fieldWeight in 1319, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=1319)
          0.5 = coord(1/2)
      0.5 = coord(2/4)
    
    Abstract
    Keyword based querying has been an immediate and efficient way to specify and retrieve related information that the user inquired. However, conventional document ranking based on an automatic assessment of document relevance to the query may not be the best approach when little information is given. Proposes an idea to integrate 2 existing techniques, query expansion and relevance feedback to achieve a concept-based information search for the Web
    Date
    1. 8.1996 22:08:06
  7. Fieldhouse, M.; Hancock-Beaulieu, M.: ¬The design of a graphical user interface for a highly interactive information retrieval system (1996) 0.02
    0.022359734 = product of:
      0.04471947 = sum of:
        0.020812286 = weight(_text_:information in 6958) [ClassicSimilarity], result of:
          0.020812286 = score(doc=6958,freq=6.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.23515764 = fieldWeight in 6958, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0546875 = fieldNorm(doc=6958)
        0.023907183 = product of:
          0.047814365 = sum of:
            0.047814365 = weight(_text_:22 in 6958) [ClassicSimilarity], result of:
              0.047814365 = score(doc=6958,freq=2.0), product of:
                0.17654699 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050415643 = queryNorm
                0.2708308 = fieldWeight in 6958, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=6958)
          0.5 = coord(1/2)
      0.5 = coord(2/4)
    
    Source
    Information retrieval: new systems and current research. Proceedings of the 16th Research Colloquium of the British Computer Society Information Retrieval Specialist Group, Drymen, Scotland, 22-23 Mar 94. Ed.: R. Leon
  8. Järvelin, K.; Kristensen, J.; Niemi, T.; Sormunen, E.; Keskustalo, H.: ¬A deductive data model for query expansion (1996) 0.02
    0.015395639 = product of:
      0.030791279 = sum of:
        0.01029941 = weight(_text_:information in 2230) [ClassicSimilarity], result of:
          0.01029941 = score(doc=2230,freq=2.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.116372846 = fieldWeight in 2230, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.046875 = fieldNorm(doc=2230)
        0.02049187 = product of:
          0.04098374 = sum of:
            0.04098374 = weight(_text_:22 in 2230) [ClassicSimilarity], result of:
              0.04098374 = score(doc=2230,freq=2.0), product of:
                0.17654699 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050415643 = queryNorm
                0.23214069 = fieldWeight in 2230, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.046875 = fieldNorm(doc=2230)
          0.5 = coord(1/2)
      0.5 = coord(2/4)
    
    Source
    Proceedings of the 19th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (ACM SIGIR '96), Zürich, Switzerland, August 18-22, 1996. Eds.: H.P. Frei et al
  9. Efthimiadis, E.N.: User choices : a new yardstick for the evaluation of ranking algorithms for interactive query expansion (1995) 0.01
    0.0128297005 = product of:
      0.025659401 = sum of:
        0.008582841 = weight(_text_:information in 5697) [ClassicSimilarity], result of:
          0.008582841 = score(doc=5697,freq=2.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.09697737 = fieldWeight in 5697, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0390625 = fieldNorm(doc=5697)
        0.01707656 = product of:
          0.03415312 = sum of:
            0.03415312 = weight(_text_:22 in 5697) [ClassicSimilarity], result of:
              0.03415312 = score(doc=5697,freq=2.0), product of:
                0.17654699 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050415643 = queryNorm
                0.19345059 = fieldWeight in 5697, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.0390625 = fieldNorm(doc=5697)
          0.5 = coord(1/2)
      0.5 = coord(2/4)
    
    Date
    22. 2.1996 13:14:10
    Source
    Information processing and management. 31(1995) no.4, S.605-620
  10. Principles of semantic networks : explorations in the representation of knowledge (1991) 0.01
    0.008850876 = product of:
      0.035403505 = sum of:
        0.035403505 = product of:
          0.07080701 = sum of:
            0.07080701 = weight(_text_:organization in 1677) [ClassicSimilarity], result of:
              0.07080701 = score(doc=1677,freq=2.0), product of:
                0.17974974 = queryWeight, product of:
                  3.5653565 = idf(docFreq=3399, maxDocs=44218)
                  0.050415643 = queryNorm
                0.39391994 = fieldWeight in 1677, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5653565 = idf(docFreq=3399, maxDocs=44218)
                  0.078125 = fieldNorm(doc=1677)
          0.5 = coord(1/2)
      0.25 = coord(1/4)
    
    Footnote
    Rez. in: Knowledge organization. 20(1993) no.1, S.60-61 (O. Sechser)
  11. Bean, C.: ¬The semantics of hierarchy : explicit parent-child relationships in MeSH tree structures (1998) 0.01
    0.00876192 = product of:
      0.03504768 = sum of:
        0.03504768 = product of:
          0.07009536 = sum of:
            0.07009536 = weight(_text_:organization in 42) [ClassicSimilarity], result of:
              0.07009536 = score(doc=42,freq=4.0), product of:
                0.17974974 = queryWeight, product of:
                  3.5653565 = idf(docFreq=3399, maxDocs=44218)
                  0.050415643 = queryNorm
                0.38996086 = fieldWeight in 42, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  3.5653565 = idf(docFreq=3399, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=42)
          0.5 = coord(1/2)
      0.25 = coord(1/4)
    
    Series
    Advances in knowledge organization; vol.6
    Source
    Structures and relations in knowledge organization: Proceedings of the 5th International ISKO-Conference, Lille, 25.-29.8.1998. Ed.: W. Mustafa el Hadi et al
  12. Ihadjadene, M.; Bouché, R.: Using syntagmatic relationships based on a RAMEAU list as a browsing relevance feedback strategy in a WWW-OPAC (1998) 0.01
    0.00876192 = product of:
      0.03504768 = sum of:
        0.03504768 = product of:
          0.07009536 = sum of:
            0.07009536 = weight(_text_:organization in 141) [ClassicSimilarity], result of:
              0.07009536 = score(doc=141,freq=4.0), product of:
                0.17974974 = queryWeight, product of:
                  3.5653565 = idf(docFreq=3399, maxDocs=44218)
                  0.050415643 = queryNorm
                0.38996086 = fieldWeight in 141, product of:
                  2.0 = tf(freq=4.0), with freq of:
                    4.0 = termFreq=4.0
                  3.5653565 = idf(docFreq=3399, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=141)
          0.5 = coord(1/2)
      0.25 = coord(1/4)
    
    Series
    Advances in knowledge organization; vol.6
    Source
    Structures and relations in knowledge organization: Proceedings of the 5th International ISKO-Conference, Lille, 25.-29.8.1998. Ed.: W. Mustafa el Hadi et al
  13. Talja, S.; Keso, H.; Pietilainen, T.: ¬The production of context in information seeking research : a metatheoretical view (1999) 0.01
    0.0072827823 = product of:
      0.02913113 = sum of:
        0.02913113 = weight(_text_:information in 6249) [ClassicSimilarity], result of:
          0.02913113 = score(doc=6249,freq=4.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.3291521 = fieldWeight in 6249, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.09375 = fieldNorm(doc=6249)
      0.25 = coord(1/4)
    
    Source
    Information processing and management. 35(1999) no.6, S.751-763
  14. Fowler, R.H.; Wilson, B.A.; Fowler, W.A.L.: Information navigator : an information system using associative networks for display and retrieval (1992) 0.01
    0.006812419 = product of:
      0.027249675 = sum of:
        0.027249675 = weight(_text_:information in 919) [ClassicSimilarity], result of:
          0.027249675 = score(doc=919,freq=14.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.3078936 = fieldWeight in 919, product of:
              3.7416575 = tf(freq=14.0), with freq of:
                14.0 = termFreq=14.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.046875 = fieldNorm(doc=919)
      0.25 = coord(1/4)
    
    Abstract
    Document retrieval is a highly interactive process dealing with large amounts of information. Visual representations can provide both a means for managing the complexity of large information structures and an interface style well suited to interactive manipulation. The system we have designed utilizes visually displayed graphic structures and a direct manipulation interface style to supply an integrated environment for retrieval. A common visually displayed network structure is used for query, document content, and term relations. A query can be modified through direct manipulation of its visual form by incorporating terms from any other information structure the system displays. An associative thesaurus of terms and an inter-document network provide information about a document collection that can complement other retrieval aids. Visualization of these large data structures makes use of fisheye views and overview diagrams to help overcome some of the inherent difficulties of orientation and navigation in large information structures.
  15. Hemmje, M.: LyberWorld - a 3D graphical user interface for fulltext retrieval (1995) 0.01
    0.006717136 = product of:
      0.026868545 = sum of:
        0.026868545 = weight(_text_:information in 2385) [ClassicSimilarity], result of:
          0.026868545 = score(doc=2385,freq=10.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.3035872 = fieldWeight in 2385, product of:
              3.1622777 = tf(freq=10.0), with freq of:
                10.0 = termFreq=10.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0546875 = fieldNorm(doc=2385)
      0.25 = coord(1/4)
    
    Abstract
    LyberWorld is a prototype IR user interface. It implements visualizations of an abstract information space: fulltext. The video demonstrates a visual user interface for the probabilistic fulltext retrieval system INQUERY. Visualizations are used to communicate information search and browsing activities in a natural way by applying metaphors of spatial navigation in abstract information spaces. Visualization tools for exploring information spaces and judging relevance of information items are introduced and an example session demonstrates the prototype. The presence of a spatial model in the user's mind is regarded as an essential contribution towards natural interaction and reduction of cognitive costs during retrieval dialogues.
  16. Hemmje, M.; Kunkel, C.; Willett, A.: LyberWorld - a visualization user interface supporting fulltext retrieval (1994) 0.01
    0.0063070743 = product of:
      0.025228297 = sum of:
        0.025228297 = weight(_text_:information in 2384) [ClassicSimilarity], result of:
          0.025228297 = score(doc=2384,freq=12.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.2850541 = fieldWeight in 2384, product of:
              3.4641016 = tf(freq=12.0), with freq of:
                12.0 = termFreq=12.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.046875 = fieldNorm(doc=2384)
      0.25 = coord(1/4)
    
    Abstract
    LyberWorld is a prototype IR user interface. It implements visualizations of an abstract information space-fulltext. The paper derives a model for such visualizations and an exemplar user interface design is implemented for the probabilistic fulltext retrieval system INQUERY. Visualizations are used to communicate information search and browsing activities in a natural way by applying metaphors of spatial navigation in abstract information spaces. Visualization tools for exploring information spaces and judging relevance of information items are introduced and an example session demonstrates the prototype. The presence of a spatial model in the user's mind and interaction with a system's corresponding display methods is regarded as an essential contribution towards natural interaction and reduction of cognitive costs during e.g. query construction, orientation within the database content, relevance judgement and orientation within the retrieval context.
    Source
    Proceeding SIGIR '94: Proceedings of the 17th annual international ACM SIGIR conference on Research and development in information retrieval
  17. Shapiro, C.D.; Yan, P.-F.: Generous tools : thesauri in digital libraries (1996) 0.01
    0.006007989 = product of:
      0.024031956 = sum of:
        0.024031956 = weight(_text_:information in 3132) [ClassicSimilarity], result of:
          0.024031956 = score(doc=3132,freq=8.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.27153665 = fieldWeight in 3132, product of:
              2.828427 = tf(freq=8.0), with freq of:
                8.0 = termFreq=8.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0546875 = fieldNorm(doc=3132)
      0.25 = coord(1/4)
    
    Abstract
    The Electronic Libraries and Information Highways MITRE Sponsored Research project aims to help searchers working in digital libraries increase their chance of matching the language of authors. Focuses on whether query formulation can be improved through the addition of semantic knowledge that is interactively gathered from a thesaurus that exists in a distributed, interoperating, cooperative environment. A prototype, ELVIS, was built that improves information retrieval through query expansion and is based on publicly available Z39.50 standard thesauri integrated with networked information discovery and retrieval tools
    Imprint
    Medford, NJ : Information Today
  18. Lund, K.; Burgess, C.; Atchley, R.A.: Semantic and associative priming in high-dimensional semantic space (1995) 0.01
    0.0059767957 = product of:
      0.023907183 = sum of:
        0.023907183 = product of:
          0.047814365 = sum of:
            0.047814365 = weight(_text_:22 in 2151) [ClassicSimilarity], result of:
              0.047814365 = score(doc=2151,freq=2.0), product of:
                0.17654699 = queryWeight, product of:
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.050415643 = queryNorm
                0.2708308 = fieldWeight in 2151, product of:
                  1.4142135 = tf(freq=2.0), with freq of:
                    2.0 = termFreq=2.0
                  3.5018296 = idf(docFreq=3622, maxDocs=44218)
                  0.0546875 = fieldNorm(doc=2151)
          0.5 = coord(1/2)
      0.25 = coord(1/4)
    
    Source
    Proceedings of the Seventeenth Annual Conference of the Cognitive Science Society: July 22 - 25, 1995, University of Pittsburgh / ed. by Johanna D. Moore and Jill Fain Lehmann
  19. Robertson, A.M.; Willett, P.: Applications of n-grams in textual information systems (1998) 0.01
    0.005946367 = product of:
      0.023785468 = sum of:
        0.023785468 = weight(_text_:information in 4715) [ClassicSimilarity], result of:
          0.023785468 = score(doc=4715,freq=6.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.2687516 = fieldWeight in 4715, product of:
              2.4494898 = tf(freq=6.0), with freq of:
                6.0 = termFreq=6.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.0625 = fieldNorm(doc=4715)
      0.25 = coord(1/4)
    
    Abstract
    Provides an introduction to the use of n-grams in textual information systems, where an n-gram is a string of n, usually adjacent, characters, extracted from a section of continuous text. Applications that can be implemented efficiently and effectively using sets of n-grams include spelling errors detection and correction, query expansion, information retrieval with serial, inverted and signature files, dictionary look up, text compression, and language identification
  20. Kwok, K.L.: ¬A network approach to probabilistic information retrieval (1995) 0.01
    0.005149705 = product of:
      0.02059882 = sum of:
        0.02059882 = weight(_text_:information in 5696) [ClassicSimilarity], result of:
          0.02059882 = score(doc=5696,freq=8.0), product of:
            0.08850355 = queryWeight, product of:
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.050415643 = queryNorm
            0.23274569 = fieldWeight in 5696, product of:
              2.828427 = tf(freq=8.0), with freq of:
                8.0 = termFreq=8.0
              1.7554779 = idf(docFreq=20772, maxDocs=44218)
              0.046875 = fieldNorm(doc=5696)
      0.25 = coord(1/4)
    
    Abstract
    Shows how probabilistic information retrieval based on document components may be implemented as a feedforward (feedbackward) artificial neural network. The network supports adaptation of connection weights as well as the growing of new edges between queries and terms based on user relevance feedback data for training, and it reflects query modification and expansion in information retrieval. A learning rule is applied that can also be viewed as supporting sequential learning using a harmonic sequence learning rate. Experimental results with 4 standard small collections and a large Wall Street Journal collection show that small query expansion levels of about 30 terms can achieve most of the gains at the low-recall high-precision region, while larger expansion levels continue to provide gains at the high-recall low-precision region of a precision recall curve
    Source
    ACM transactions on information systems. 13(1995) no.3, S.324-353

Languages

  • e 47
  • d 3
  • chi 1
  • More… Less…

Types

  • a 45
  • el 3
  • r 3
  • m 2
  • p 1
  • More… Less…